CN217374973U

CN217374973U - Automatic facial mask bagging mechanism

Info

Publication number: CN217374973U
Application number: CN202220632681.3U
Authority: CN
Inventors: 罗浪
Original assignee: Changde Yinuo Biomedical Co ltd
Current assignee: Changde Yinuo Biomedical Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-09-06
Anticipated expiration: 2032-03-23

Abstract

The utility model discloses an automatic facial mask bagging mechanism, including bag body storage mechanism, bag body conveying mechanism, filling mechanism and sealing mechanism, placed the frame subaerial, be provided with bag body storage mechanism at the top of frame, be provided with filling mechanism in the frame of bag body storage mechanism below, be provided with bag body conveying mechanism between filling mechanism and bag body storage mechanism, through bag body conveying mechanism with the bag body carry the below of filling mechanism, be provided with bag body mouth opening subassembly in the frame, realize opening the filling of bag body through bag body opening mechanism, be provided with the meter heavy subassembly on bag body opening subassembly; the automatic packing of facial mask is convenient for realize, promotes the packing efficiency of facial mask packing like this, reduces staff's intensity of labour simultaneously, also avoids the facial mask by bacterial contamination's in the packing possibility, weighs when carrying out the filling simultaneously, has guaranteed the uniformity of bag form like this.

Description

Automatic facial mask bagging mechanism

Technical Field

The utility model relates to a facial mask equipment for packing field, concretely relates to automatic bagging-off mechanism of facial mask.

Background

The existing facial mask needs to be bagged after being completely processed, so that the facial mask needs to be filled into a bag body for packaging when being processed, the existing facial mask is mainly bagged manually or semi-automatically, the packaging efficiency is low, and meanwhile, if manual packaging is adopted, bacteria are carried by a human body and can possibly enter the packaging bag to be polluted when wearing dust-free clothes, and meanwhile, if workers wear protective clothes for packaging, the packaging action of the workers can be influenced by the dust-free clothes to reduce the packaging efficiency;

meanwhile, when the facial mask is packaged, automatic packaging cannot be achieved, so that the labor intensity of workers is high, meanwhile, when the workers package, the operation is complex, step errors are easy to generate in the filling process, and the liquid facial mask flows to the ground to form waste.

Disclosure of Invention

Not enough to above-mentioned prior art, the utility model provides an automatic bagging-off mechanism of facial mask is convenient for realize the automatic packing of facial mask, promotes the packing efficiency of facial mask packing like this, reduces staff's intensity of labour simultaneously, also avoids the facial mask by bacterial contamination's possibility in the packing, weighs when carrying out the filling simultaneously, has guaranteed the uniformity of bag form like this.

In order to achieve the above purpose, the utility model discloses a scheme: an automatic facial mask bagging mechanism comprises a bag body storage mechanism, a bag body conveying mechanism, a filling mechanism and a sealing mechanism, wherein a rack is placed on the ground, the bag body storage mechanism is arranged at the top of the rack, the filling mechanism is arranged on the rack below the bag body storage mechanism, the bag body conveying mechanism is arranged between the filling mechanism and the bag body storage mechanism, a bag body is conveyed to the position below the filling mechanism through the bag body conveying mechanism, a bag body opening component is arranged on the rack, the bag body is opened and filled through the bag body opening mechanism, a weighing component is arranged on the bag body opening component, and weighing is realized through the weighing component; a sealing mechanism is arranged below the bag body conveying mechanism, an unloading slide way is arranged below the sealing mechanism, and the packaged bag body is conveyed away through the unloading slide way.

Preferably, the bag body storage mechanism comprises storage tanks and an elastic push plate, wherein a plurality of storage tanks are arranged side by side, each storage tank is arranged on the rack, an elastic push plate is arranged in each storage tank, a plurality of bag bodies in the storage tanks are pushed towards one ends of the storage tanks through the elastic push plate, notches for the bag bodies to pass through are formed in the front end surfaces of the storage tanks, and the width of each notch is smaller than that of each bag body; a bag body conveying mechanism is arranged at the front side of the storage tank; bag body conveying mechanism includes transfer passage, adsorption component and swing baffle, wherein be provided with downwardly extending's transfer passage on the preceding terminal surface of hold up tank, one side of keeping away from the hold up tank at transfer passage is provided with adsorption component, adsorb the transfer passage in with the bag body in the hold up tank through adsorption component, all be provided with downwardly extending's breach before transfer passage on lateral wall and the back lateral wall, last breach of transfer passage supply adsorption component pass can, be provided with swing baffle bottom transfer passage, realize preventing the gliding of the bag body through swing baffle.

Preferably, the bottom of the conveying channel is a curved channel which is bent backwards, opening assemblies are arranged on the front side and the rear side of the conveying channel close to the bottom, each opening assembly comprises a fixing plate, a negative pressure suction head and a moving module, the fixing plates are located on the two sides of the conveying channel, a plurality of negative pressure suction heads are arranged on each fixing plate, each negative pressure suction head penetrates through a notch of the conveying channel and extends into the conveying channel, the moving module is arranged between each fixing plate and the rack, and the opening of the bag body is realized through the moving module; a filling mechanism is arranged outside the conveying channel and penetrates through the conveying channel to fill the bag bodies; the filling mechanism comprises a storage barrel, filling heads and a telescopic assembly, wherein the storage barrel is arranged at the top of the frame, a plurality of filling heads and filling heads are arranged on the frame, the filling heads extend into the conveying channel from top to bottom, the filling heads and the storage barrel are connected through a pipeline, the telescopic assembly is arranged between the filling heads and the frame, and the telescopic assembly realizes the telescopic function of the filling heads.

Preferably, a sealing mechanism is arranged at the bottom of the conveying channel and comprises a heat sealing assembly and a rotating assembly, wherein a sliding assembly which can slide up and down is arranged on the rack, and a negative pressure suction head positioned at the rear side of the conveying channel is arranged on the sliding assembly to move up and down so as to drive the filled bag body to lift; the heat-seal assembly comprises a swinging heat-seal strip and a moving heat-seal strip, the swinging heat-seal strip is arranged on the rack through a rotating shaft, a plurality of rotating shafts on the swinging heat-seal strips are linked through a chain gear, each swinging heat-seal strip is positioned between two adjacent conveying channels, the moving heat-seal strip is arranged opposite to the swinging heat-seal strip, the moving heat-seal strip is fixed on the flat plate, two ends of the flat plate are fixed on the rack through the moving assembly, and the bag mouth is compressed by the swinging heat-seal strip and the moving heat-seal strip through retraction of the moving assembly.

Preferably, the weight-measuring assembly is arranged between the fixing plate and the negative pressure suction head, the weight-measuring mechanism comprises a sliding rail, a sliding seat, a spring and a proximity switch, wherein the sliding rail is vertically arranged on the fixing plate, the sliding seat sliding on the sliding rail is arranged on the sliding rail, the spring is arranged between the sliding seat and the sliding rail, the proximity switch and the two proximity switches are arranged on the sliding seat and the sliding rail and are opposite up and down, and the proximity switch on the sliding rail is provided with the height adjusting assembly.

Compared with the prior art, the utility model has the advantages of: 1. the automatic packing of facial mask is convenient for realize, promotes the packing efficiency of facial mask packing like this, reduces staff's intensity of labour simultaneously, also avoids the facial mask by bacterial contamination's in the packing possibility, weighs when carrying out the filling simultaneously, has guaranteed the uniformity of bag form like this.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a schematic view of the bag storage mechanism of the present invention.

Fig. 4 is a schematic view of the bag body conveying mechanism of the present invention.

Fig. 5 is a schematic view of the weighing module of the present invention.

The automatic bag filling machine comprises a bag storage mechanism 1, a bag storage mechanism 1.1, a storage tank 1.2, an elastic push plate 2, a bag conveying mechanism 2.1, a conveying channel 2.2, an adsorption component 2.3, a swing baffle plate 3, a filling mechanism 3.1, a storage barrel 3.2, a filling head 3.3, a telescopic component 4, a sealing mechanism 4.2, a swing heat sealing strip 4.3, a movable heat sealing strip 4.4, a rotating component 4.5, a discharging slideway 5, a rack 6, an opening component 6.1, a fixed plate 6.2, a negative pressure suction head 7, a weighing component 7.1, a sliding rail 7.2, a sliding seat 7.3, a spring 7.4, a proximity switch 7.5, a height adjusting component 8 and a sliding component.

Detailed Description

The present invention will now be further elucidated with reference to the accompanying drawings.

As shown in fig. 1-5, an automatic facial mask bagging mechanism comprises a bag storage mechanism 1, a bag conveying mechanism 2, a filling mechanism 3 and a sealing mechanism 4, wherein a frame 5 (the frame 5 is mainly a frame body for fixing parts) is fixed on the ground in a bolt fastening manner, the bag storage mechanism 1 is fixed at the top of the frame 5 in a bolt fastening manner, a plurality of bags are stacked in the bag storage mechanism 1 for storage, the filling mechanism 3 is fixed on the frame 5 below the bag storage mechanism 1 in a bolt fastening manner, the bag conveying mechanism 2 is arranged between the filling mechanism 3 and the bag storage mechanism 1, the bags are conveyed below the filling mechanism 3 through the bag conveying mechanism 2, the filling mechanism 3 extends into the bags for filling, the bag opening component 6 is fixed on the frame 5 in a bolt fastening manner, the bag body opening and filling are realized through the bag body opening mechanism (the bag body needs to be opened before the filling mechanism 3 is filled, and meanwhile, the filling mechanism 3 extends into the bag body for filling), the bag body opening component is provided with a weighing component 7 (the bag body is weighed when filling is carried out, so that quantitative filling is realized, manual weighing is not needed subsequently, the labor intensity of workers is reduced), weighing is realized through the weighing component, and when the filling weight is reached, the filling mechanism 3 stops filling; the frame 5 of the below of bag body conveying mechanism 2 is fixed with through the mode of bolt-up and seals mechanism 4, after the filling of filling mechanism 3 finishes, the bag body downstream seals through sealing mechanism 4, be fixed with the slide 4.5 of unloading through the mode of bolt-up on the frame 5 of mechanism 4 below sealing, the bag body that finishes that seals falls to slide away in the slide 4.5 of unloading, carry away the bag body of packing through the slide 4.5 of unloading, accomplish the automatic bagging-off of facial mask like this and seal.

The bag body storage mechanism 1 comprises storage tanks 1.1 and an elastic push plate 1.2, wherein the storage tanks 1.1 are arranged side by side, each storage tank 1.1 is fixed on a rack 5 in a bolt fastening mode, the front end of each storage tank 1.1 inclines downwards, the elastic push plate 1.2 is arranged in each storage tank 1.1 (the elastic push plate 1.2 is placed in the storage tank 1.1, a spring 7.3 is fixed on the back of the elastic push plate 1.2 in a welding mode, the other end of the spring 7.3 is fixed in the storage tank 1.1 in a welding mode, a plurality of bag bodies are pushed forwards through the elastic push plate 1.2, the front end face of each bag body abuts against the front end face of the storage tank 1.1), the plurality of bag bodies in the storage tanks 1.1 are pushed towards the front end of the storage tanks 1.1 through the elastic push plate 1.2, the front end face of the storage tank 1.1 is provided with a notch for the bag body to pass through, and the notch width is smaller than that of the bag body; a bag body conveying mechanism 2 is fixed at the front side of the storage tank 1.1 in a bolt fastening mode; the bag body conveying mechanism 2 comprises a conveying channel 2.1, an adsorption component 2.2 and a swing baffle 2.3, wherein the conveying channel 2.1 extending downwards is fixed on the front end face of the storage tank 1.1 in a bolt fastening mode, the adsorption component 2.2 is arranged on one side of the conveying channel 2.1 far away from the storage tank 1.1 (the adsorption component 2.2 comprises a connecting plate and a plurality of material taking negative pressure suction heads, a plurality of vertical waist-shaped holes are formed in the connecting plate, two screw rods are inserted into each waist-shaped hole, the material taking negative pressure suction heads are fixed on each screw rod in a welding mode, a nut is sleeved on each screw rod, the material taking negative pressure suction heads are fixed on the connecting plate through the nuts and the material taking negative pressure suction heads, the material taking negative pressure suction heads penetrate through gaps of the conveying channel 2.1 and gaps of the storage tank 1.1 and are adsorbed on the outer wall of the bag body, the bag body is pulled to the conveying channel 2.1 through the material taking negative pressure suction heads moving forwards, an air cylinder is fixed between a connecting plate and a frame 5 in a welding mode, the movement of a material taking negative pressure suction head is realized through the expansion and contraction of the air cylinder to realize the transfer of a bag body), the bag body in a storage tank 1.1 is adsorbed into a conveying channel 2.1 through an adsorption component 2.2, gaps extending downwards are formed in the front side wall and the rear side wall of the conveying channel 2.1, the gaps in the conveying channel 2.1 are used for the adsorption component 2.2 to pass through, a swing baffle 2.3 is fixed at the bottom of the conveying channel 2.1 through a bearing (the left end and the right end of the swing baffle 2.3 are fixed on the left side wall and the right side wall of the conveying channel 2.1 through a bearing, a motor is fixed at the right end of the swing baffle 2.3 in a welding mode, the rotation of the swing baffle 2.3 is realized through the rotation of the motor, when the swing baffle 2.3 rotates to a horizontal state, the bottom of the conveying channel 2.1 is blocked, when the swing baffle 2.3 rotates to a vertical state, the bottom of the conveying channel 2.1 can be circulated), the bag body is prevented from sliding downwards through the swing baffle 2.3, namely when the negative pressure suction head 6.2 loses the negative pressure state, the bag body falls on the swing baffle 2.3 along the conveying channel 2.1, and after the bag is completely shaped, the swing baffle 2.3 swings downwards to realize blanking.

The bottom of the conveying channel 2.1 is a curved channel which is bent backwards, opening assemblies are fixed on the machine frame 5 on the front side and the rear side of the conveying channel 2.1 close to the bottom in a bolt fastening mode, each opening assembly comprises a fixing plate 6.1, a negative pressure suction head 6.2 and a moving module, the fixing plates 6.1 are located on the front side and the rear side of the conveying channel 2.1, a plurality of negative pressure suction heads 6.2 are fixed on each fixing plate 6.1 in a welding mode, each negative pressure suction head 6.2 penetrates through a notch of the conveying channel 2.1 and extends into the conveying channel 2.1, the moving module is fixed between each fixing plate 6.1 and the machine frame 5 in a welding mode (the moving module is an air cylinder, opening of a bag mouth is achieved through stretching of the air cylinder), and opening of the bag body is achieved through the moving module; a filling mechanism 3 is arranged outside the conveying channel 2.1, the filling mechanism 3 is fixed on a rack 5 through bolts, and the filling mechanism 3 fills the bag body through the conveying channel 2.1 (the filling mechanism 3 extends into the bag body through the conveying channel 2.1 for filling); the filling mechanism 3 comprises a storage cylinder 3.1, a filling head 3.2 and a telescopic component 3.3, the storage cylinder 3.1 is fixed on the top of the frame 5 through a bolt, a liquid mask is placed in the storage cylinder 3.1, a plurality of filling heads 3.2 are fixed on the frame 5 in a bolt fastening mode, the filling heads 3.2 extend into the conveying channel 2.1 from top to bottom, the filling head 3.2 is connected with the storage cylinder 3.1 through a pipeline, a telescopic component 3.3 is arranged between the filling head 3.2 and the frame 5 (the telescopic component 3.3 is a cylinder, the cylinder body of the cylinder is fixed on the frame 5 through a bolt, the piston rod of the cylinder is fixed on the filling head 3.2 through a welding mode, and the filling head 3.2 is extended into the bag body for filling through the expansion of the cylinder), the extension and contraction of the filling head 3.2 are realized through the extension and contraction component 3.3, the filling head 3.2 is connected and communicated with the pump, the facial mask in the storage cylinder 3.1 is pumped into the filling head 3.2 by a pump for automatic filling.

A sealing mechanism 4 is fixed at the bottom of the conveying channel 2.1 by welding, the sealing mechanism 4 comprises a heat sealing component (namely, a heat sealing is carried out by a heating and pressing mode) and a rotating component 4.4, wherein a sliding component 8 which slides up and down is fixed on the frame 5 by a bolt fastening mode, a negative pressure suction head 6.2 positioned at the rear side of the conveying channel 2.1 is fixed on the sliding component 8 by welding to move up and down (the sliding component 8 comprises a vertical sliding rail and a first sliding seat 7.2, the sliding rail is fixed on the sliding rail on the frame 5 by a bolt and is clamped with the first sliding seat 7.2 which slides on the sliding rail, a linear motor is arranged between the first sliding seat 7.2 and the sliding rail, a rotor of the linear motor is fixed on the first sliding seat 7.2 by a bolt fastening mode, a stator rail of the linear motor is fixed on the sliding rail by a welding mode, the up and down movement of the first sliding seat 7.2 is realized by the expansion and contraction of an air cylinder, the adsorption component 2.2 positioned at the rear end of the opening component is fixed on the first sliding seat 7.2 in a welding mode (the cylinder body of the adsorption component 2.2 at the rear end is fixed on the first sliding seat 7.2 in a welding mode, the adsorption component 2.2 at the whole rear end is driven to lift through the lifting of the first sliding seat 7.2), and the filled bag body is driven to move downwards through the first sliding seat 7.2), so that the filled bag body is driven to lift, when the bag body is filled, the negative pressure suction head 6.2 at the front end of the opening component loses a negative pressure state, the negative pressure suction head 6.2 at the rear end of the opening component is continuously adsorbed on the outer wall of the bag body, and the bag body is driven to descend to the sealing mechanism 4 to seal through the negative pressure suction head 6.2 under the action of the sliding seat 7.2; the sealing mechanism 4 comprises a swinging heat-sealing strip 4.2 and a moving heat-sealing strip 4.3, the swinging heat-sealing strip 4.2 is arranged on the frame 5 through a rotating shaft (the swinging heat-sealing strip 4.2 is fixed on the rotating shaft through a welding mode, the rotating shaft is fixed on the frame 5 through a bearing, so the swinging heat-sealing strip 4.2 can rotate), a plurality of rotating shafts on the swinging heat-sealing strips 4.2 are linked through chain gears (the gears are fixed on each rotating shaft through a welding mode, the gears on the plurality of rotating shafts are linked through chains meshed with the plurality of gears, a motor is fixed on one rotating shaft through a welding mode, the plurality of rotating shafts are driven to rotate through the motor), each swinging heat-sealing strip 4.2 is positioned between two adjacent conveying channels 2.1, so the bag body is influenced by the swinging heat-sealing strip 4.2 when the bag body descends, the moving heat-sealing strip 4.3 is arranged opposite to the swinging heat-sealing strip 4.2, the movable heat-seal strip 4.3 is fixed on the flat plate in a bolt fastening mode, the two ends of the flat plate are fixed on the rack 5 through the movable assembly (the movable assembly is an air cylinder, the movable heat-seal strip 4.3 is drawn close to the swing heat-seal strip 4.2 through the expansion and contraction of the air cylinder, so that the hot-pressing sealing of the bag body is realized), and the swing heat-seal strip 4.2 and the movable heat-seal strip 4.3 are compressed tightly on the bag opening through the retraction of the movable assembly.

The weight measuring assembly 7 is arranged between the fixing plate 6.1 and the negative pressure suction head 6.2, the weight measuring mechanism comprises a sliding rail 7.1, a second sliding seat 7.2, a spring 7.3 and a proximity switch 7.4, wherein the fixing plate 6.1 is fixedly provided with a plurality of vertically arranged sliding rails 7.1 in a bolt fastening mode, the sliding rail 7.1 is clamped with the second sliding seat 7.2 which slides up and down on the sliding rail 7.1, the spring 7.3 is arranged between the sliding seat 7.2 and the sliding rail 7.1 (the bottom of the spring 7.3 is fixed on the fixing plate 6.1 in a welding mode, the top of the spring 7.3 is fixed on the second sliding seat 7.2 in a welding mode, when the facial mask is filled in the bag body, the second sliding seat 7.2 slides down under the action of gravity), the sliding seat 7.2 and the sliding rail 7.1 are both fixedly provided with the proximity switch 7.4 and two proximity switches 7.4 (the type is 04-N, ) The upper and lower is relative, when two proximity switch 7.4 were close to and triggered, it is up to standard to show bag internal filling facial mask weight, stopped the filling like this, be provided with on the proximity switch 7.4 that is located on sliding rail 7.1 (height adjusting subassembly 7.5 is lead screw and screw sleeve promptly, is fixed with screw sleeve through the welded mode on sliding rail 7.1, passes in screw sleeve and has the lead screw with screw sleeve screw-thread fit, lead screw and proximity switch 7.4 welded fastening).

Claims

1. An automatic facial mask bagging mechanism comprises a bag body storage mechanism, a bag body conveying mechanism, a filling mechanism and a sealing mechanism, wherein a rack is placed on the ground, and the bag body storage mechanism is arranged at the top of the rack; a sealing mechanism is arranged below the bag body conveying mechanism, an unloading slide way is arranged below the sealing mechanism, and the packaged bag body is conveyed away through the unloading slide way.

2. The automatic facial mask bagging mechanism according to claim 1, wherein the bag body storage mechanism comprises a plurality of storage tanks and an elastic push plate, wherein the storage tanks are arranged side by side and each storage tank is arranged on the frame, the elastic push plate is arranged in each storage tank, the plurality of bag bodies in the storage tanks are pushed towards one ends of the storage tanks through the elastic push plate, notches for the bag bodies to pass through are formed in the front end surfaces of the storage tanks, and the width of the notches is smaller than that of the bag bodies; a bag body conveying mechanism is arranged at the front side of the storage tank; bag body conveying mechanism includes transfer passage, adsorption component and swing baffle, wherein be provided with downwardly extending's transfer passage on the preceding terminal surface of hold up tank, one side of keeping away from the hold up tank at transfer passage is provided with adsorption component, adsorb the transfer passage in with the bag body in the hold up tank through adsorption component, all be provided with downwardly extending's breach before transfer passage on lateral wall and the back lateral wall, last breach of transfer passage supply adsorption component pass can, be provided with swing baffle bottom transfer passage, realize preventing the gliding of the bag body through swing baffle.

3. The automatic facial mask bagging mechanism according to claim 2, wherein a curved channel which is bent backwards is arranged at the bottom of the conveying channel, opening assemblies are arranged on the front side and the rear side of the conveying channel, which are close to the bottom, and each opening assembly comprises a fixed plate, a negative pressure suction head and a moving module, wherein the fixed plates are arranged on the two sides of the conveying channel, a plurality of negative pressure suction heads are arranged on each fixed plate, each negative pressure suction head penetrates through a gap of the conveying channel and extends into the conveying channel, the moving module is arranged between each fixed plate and the rack, and the bag bodies are opened through the moving module; a filling mechanism is arranged outside the conveying channel and penetrates through the conveying channel to fill the bag bodies; the filling mechanism comprises a storage barrel, filling heads and a telescopic assembly, wherein the storage barrel is arranged at the top of the frame, a plurality of filling heads and filling heads are arranged on the frame, the filling heads extend into the conveying channel from top to bottom, the filling heads and the storage barrel are connected through a pipeline, the telescopic assembly is arranged between the filling heads and the frame, and the telescopic assembly realizes the telescopic function of the filling heads.

4. The automatic facial mask bagging mechanism according to claim 3, wherein a sealing mechanism is arranged at the bottom of the conveying channel and comprises a heat sealing component and a rotating component, wherein a sliding component which slides up and down is arranged on the rack, and a negative pressure suction head positioned at the rear side of the conveying channel is arranged on the sliding component to move up and down so as to drive a filled bag body to lift; the heat-seal assembly comprises a swinging heat-seal strip and a moving heat-seal strip, the swinging heat-seal strip is arranged on the rack through a rotating shaft, a plurality of rotating shafts on the swinging heat-seal strips are linked through a chain gear, each swinging heat-seal strip is positioned between two adjacent conveying channels, the moving heat-seal strip is arranged opposite to the swinging heat-seal strip, the moving heat-seal strip is fixed on the flat plate, two ends of the flat plate are fixed on the rack through the moving assembly, and the bag mouth is compressed by the swinging heat-seal strip and the moving heat-seal strip through retraction of the moving assembly.

5. The automatic facial mask bagging mechanism according to claim 4, wherein the weight measuring assembly is arranged between the fixing plate and the negative pressure suction head, the weight measuring mechanism comprises a sliding rail, a sliding seat, a spring and a proximity switch, wherein the fixing plate is provided with a plurality of vertically arranged sliding rails, the sliding rail is provided with the sliding seat which slides on the sliding rail, the spring is arranged between the sliding seat and the sliding rail, the sliding seat and the sliding rail are both provided with the proximity switch, the two proximity switches are vertically opposite, and the proximity switch on the sliding rail is provided with the height adjusting assembly.